Ballistic coefficient relationship to velocity ... a set of data .. trend.September 23 2009 at 4:40 AM
Yrrah (Login Yrrah)
which may be of some interest to those who didn't see it before.
Shot with one rifle and one pellet type JSB Exact 15.9 gr.
The 40 shots are rank ordered according to near range velocity. Each shot shows near range velocity at 6 ft and far range velocity at 36 ft and the BC for that individual shot.
The right side column shows mean near range velocity, average Mach number and average BC for each ten shots according to their ranked number
(not the order of shooting) and so are random in terms of possible environmental changes.
Errata: the # 4 shot from the top should read BC .0254
It can be seen that there is a trend for BC to go up as near range velocity goes down. It should be noted that muzzle velocity would be some 6+ fps faster than at near range. The velocity range brackets the velocity of 875 fps to 880 fps favored by many shooters as being a desirable velocity for precision shooting. ......... Kind regards, Yrrah.
|This message has been edited by Yrrah on Sep 23, 2009 8:40 AM|
- Interesting! - Dan Bollinger on Sep 23, 2009, 9:16 AM
- 23% increase in BC when velocity drops about 30fps! - Herb1836 on Sep 23, 2009, 9:17 AM
- Re: Ballistic coefficient relationship to velocity ... a set of data .. trend. - ray carter on Sep 23, 2009, 9:54 AM
- going to be intresting with the new FX smooth twist barrel - Luis on Sep 23, 2009, 11:34 AM
- it would have been a better setup if the two chronys used one common time base..nt - davex on Sep 23, 2009, 12:15 PM
- It would be interesting to see group sizes matched to fps - RedFeather on Sep 23, 2009, 1:22 PM